Beam shaper

ABSTRACT

Described are an improved automated luminaire and luminaire systems employing a matching lenslet pair beam shaper. The beam shaper employs nesting lenslets that are articulated so that the degree of beam shaping modulation is continuously adjustable across a range of modulation.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.12/880,075 filed Sep. 11, 2010 by Pavel Jurik entitled, “Beam Shaper”,which claims priority to U.S. Provisional Application No. 61/241,645filed Sep. 11, 2009 by Pavel Jurik entitled, “Beam Shaper”.

TECHNICAL FIELD OF THE DISCLOSURE

The present disclosure generally relates to automated luminaire(s),specifically to a beam shaper for use within automated luminaire(s).

BACKGROUND OF THE DISCLOSURE

Luminaires with automated and remotely controllable functionality arewell known in the entertainment and architectural lighting markets. Suchproducts are commonly used in theatres, television studios, concerts,theme parks, night clubs, and other venues. A typical product willcommonly provide control over the pan and tilt functions of theluminaire allowing the operator to control the direction the luminaireis pointing and thus the position of the light beam on the stage or inthe studio. Typically this position control is done via control of theluminaire's position in two orthogonal rotational axes usually referredto as pan and tilt. Many products provide control over other parameterssuch as the intensity, color, focus, beam size, beam shape, and beampattern. The beam pattern is often provided by a stencil or slide calleda gobo which may be a steel, aluminum, or etched glass pattern. Theproducts manufactured by Robe Show Lighting such as the ColorSpot 700Eare typical of the art.

The optical systems of such luminaires may include a beam shapingoptical element through which the light is constrained to pass. A beamshaping element may comprise an asymmetric or lenticular lens orcollection of lenses that constrain a light beam that is symmetrical andcircular in cross section to one that is asymmetrical and predominantlyelliptical or rectangular in cross section. A prior art automatedluminaire may contain a plurality of such beam shapers each of which mayhave a greater or lesser effect on the light beam and that may beoverlapped to produce a composite effect. For example, a weak beamshaper may constrain a circular beam that has a symmetrical beam angleof 20° in all directions into a primarily elliptical beam that has amajor axis of 30° and a minor axis of 15°. A more powerful beam shapermay constrain a circular beam that has a symmetrical beam angle of 20°in all directions into a primarily elliptical beam that has a major axisof 40° and a minor axis of 10°. It is also common in prior artluminaires to provide the ability to rotate the beam shaper along theoptical axis such that the resultant symmetrical elliptical beam mayalso be rotated. U.S. Pat. No. 5,665,305; U.S. Pat. No. 5,758,955; U.S.Pat. No. 5,980,066; and U.S. Pat. No. 6,048,080 disclose such a systemwhere a plurality of discrete lens elements are used to control theshape of a light beam.

FIG. 1 illustrates a typical multiparameter automated luminaire system10. These systems commonly include a plurality of multiparameterautomated luminaires 12 which typically each contain on-board a lightsource (not shown), light modulation devices, electric motors coupled tomechanical drive systems, and control electronics (not shown). Inaddition to being connected to mains power either directly or through apower distribution system (not shown), each automated luminaire 12 isconnected in series or in parallel to data link 14 to one or morecontrol desks 15. The automated luminaire system 10 is typicallycontrolled by an operator through the control desk 15.

FIG. 2 illustrates a typical automated luminaire 12. A lamp 21 containsa light source 22 which emits light. The light is reflected andcontrolled by reflector 20 through an aperture or imaging gate 24 andthen through a variable aperture (not shown). The resultant light beammay be further constrained, shaped, colored, and filtered by opticaldevices 26 which may include dichroic color filters, beam shapers,gobos, rotating gobos, framing shutters, effects glass, and otheroptical devices well known in the art. The final output beam may betransmitted through output lenses 28 and 31 which may form a zoom lenssystem.

FIG. 3 and FIG. 4 illustrate the construction and operation of a priorart example of a beam shaper 30. FIG. 3 illustrates a beam shaper 30that comprises a disc of optically transparent material such as glass orpolycarbonate that is embossed or molded with a pattern or array ofraised or lowered linear areas 32 to form an array of ribbed orlenticular lenses. When the substantially circular light beam passesthrough this ribbed or lenticular lens the cross section 34 of that beamwill be constrained to a cross section that is asymmetrical andpredominantly elliptical or rectangular in shape as shown in FIG. 4.Such a system may be rotated around an axis parallel with the opticalaxis of the luminaire to rotate the elliptical beam shown in FIG. 4,however, neither the size of the ellipse nor its eccentricity can bealtered by this beam shaper 30. Prior arts systems may contain multiplesuch devices with different patterns such that the size and eccentricityof the effect can be selected by using the appropriate beam shaper 30.However, this selection is discrete and provides the user no opportunityto continuously, over a range, adjust the magnitude of the effect. Forexample, if a different degree of eccentricity is desired a differentbeam shaper 30 needs to be inserted into the light beam path. Assuming aluminaire had two beam shapers 30 that could be substituted for eachother, three discrete degrees of eccentricity effect could be achieved:no beam shaper, beam shaper 1, and beam shaper 2. However, the usercould not vary the degrees of eccentricity between these two effects. Iftwo beam shapers 30 could simultaneously be placed in the beam then four(4) effects may be achieved: no beam shaper, both beam shaperssimultaneously and, assuming the beam shapers were not the same, eachwould individually have a different degree of effect.

There is a need for an improved beam shaper mechanism for an automatedluminaire which provides the ability to smoothly and continuously adjustthe size and/or eccentricity of the constrained light beam over a rangeof sizes and/or degrees of eccentricity.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present disclosure and theadvantages thereof, reference is now made to the following descriptiontaken in conjunction with the accompanying drawings in which likereference numerals indicate like features and wherein:

FIG. 1 illustrates a typical multiparameter automated lighting system;

FIG. 2 illustrates a typical automated luminaire;

FIG. 3 illustrates a prior art beam shaper;

FIG. 4 illustrates a light beam after being modulated by the beam shaperof FIG. 3;

FIG. 5 illustrates a cross section of an innovative beam shaper lenspairing;

FIG. 6A, FIG. 6B, and FIG. 6C illustrate the beam shaping modulatingeffect of the beam shaper pairing illustrated in FIG. 5;

FIG. 7 illustrates a cross sectional view of a beam shaper comprised ofmultiple lenslets;

FIG. 8 illustrates a cross sectional view of an embodiment of an arraystructure with elliptical shaped lenslets;

FIG. 9 illustrates an alternative embodiment of a beam shaper;

FIG. 10 illustrates a cross sectional view of a further embodiment ofthe beam shaper illustrated in FIG. 7 with the lenslet pairings closelynested;

FIG. 11 illustrates a cross sectional view of a further embodiment ofthe beam shaper illustrated in FIG. 7 with the lenslet pairingsseparated;

FIG. 12 illustrates a further embodiment of the beam shaper withdifferently shaped and configured lenslets;

FIG. 13 illustrates an embodiment of a luminaire employing two beamshaper lens pairings;

FIG. 14 illustrates a view of the embodiment of FIG. 13 showing the beamshaper pairings separated;

FIG. 15 illustrates an alternative embodiment of a beam shaper where thetwo beam shaper pairings share a common optical element;

FIG. 16 illustrates an alternative embodiment of a beam shaper employingan LED array light source; and

FIG. 17 illustrates an alternative embodiment of a beam shaper employingan LED array light source to serve as a lenslet array.

DETAILED DESCRIPTION OF THE DISCLOSURE

Preferred embodiments of the present disclosure are illustrated in theFIGUREs, like numerals being used to refer to like and correspondingparts of the various drawings.

The present disclosure generally relates to an automated luminaire,specifically to the configuration of a beam shaper lens within such aluminaire such that it provides the ability to adjust the size oreccentricity of the constrained light beam.

FIG. 5 illustrates a side view cross section of an innovative beamshaper lens pairing 40. In this embodiment, the pairing 40 is comprisedof two optical elements 44 and 46. Element 44 may comprise a lensletwith at least one convex surface 45 and light beam view cross section48. Element 46 may comprise a second lenslet with at least one concavesurface 47 and a matching light beam view cross section 48. The convexsurface 45 of element 44 and concave surface 47 of element 46 have equaland opposite geometries such that the convex surface 45 on element 44may substantially nest into the concave surface 47 on element 46.Elements 44 and 46 may be circular or non-circular in cross section.Cross section 48 may be an ellipse as illustrated in FIG. 5. However,elements 44 and 46 may have any cross section 48 including, for example,circular, rectangular, ribbed, elliptical, lenticular, or nearly anyother suitable shape.

FIG. 6A, FIG. 6B and FIG. 6C together illustrate the operation of thebeam shaper lens pairing 40 of FIG. 5, where the cross section 48 ofoptical elements 44 and 46 is non-circular. The first and second opticalelements 44 and 46 may be moved parallel to the optical axis of theluminaire such that their relative separation along that axis may beadjusted. The movement of the elements 44 and 46 is facilitated bymechanical articulation means which are not shown. There are well knownmethods in the art for articulating such movement of optical elements 44and 46 in a luminaire. The cross sectional shape of the input light beam43 entering the beam shaper lens pairing 40 is illustrated to the leftin each FIG. 6A, FIG. 6B, and FIG. 6C. The cross sectional shape of thelight beam output 49 of the light beam exiting from the beam shaper lenspairing 40 is illustrated to the right in FIGS 6A-6C.

FIG. 6A illustrates the optical elements 44 and 46 of beam shaper lenspairing 40 substantially nested so that the convex surface 45 on element44 is as close as reasonably possible to the concave surface 47 onelement 46. In this configuration/position the optical effect of the twocurved surfaces is cancelled out and the combination of optical elements44 and 46 has almost no effect on the light beam output 49. In thisposition, the input light beam 43 cross section is unaffected by opticalelements 44 and 46 and emerges from the system unchanged as light beamoutput 49.

FIG. 6B illustrates the optical elements 44 and 46 of beam shaper lenspairing 40 in a slightly separated position. In this position theoptical effect of the two curved surfaces 45 and 47 is combined suchthat a circular input light beam 43 is constrained to a new non-circularlight beam output 49. In the illustrated configuration, the output lightbeam is elliptical in cross section with a relatively small eccentricityand a relatively small increase in beam angle.

FIG. 6C illustrates the optical elements 44 and 46 of beam shaper lenspairing 40 where the two curved surfaces 45 and 47 are greatlyseparated. In this position, the optical effect of the two curvedsurfaces 45 and 47 is combined such that a circular input light beam 43is constrained to a new non-circular light beam output 49. In theconfiguration illustrated, the output light beam is elliptical in crosssection with a larger eccentricity and the output beam is significantlyincreased in beam angle.

Although only three positions of optical elements 44 and 46 of beamshaper lens pairing 40 are illustrated in FIG. 6A, FIG. 6B and FIG. 6C,in practice the separation of optical elements 44 and 46 along theoptical axis may be adjustable continuously across a range and thus thesize of the output beam may also be adjustable continuously across arange. This system allows the user to select any degree of beam shapingdesired and is an improvement over prior art systems.

A special case of the embodiments illustrated in FIGS. 6A-6C occurs whenthe cross sections of optical elements 44 and 46 are circles. In thatinstance, the light beam output 49 will be unchanged in cross sectionfrom the input light beam 43 and the system will alter the beam angle(size) of the output only.

FIG. 7 and FIG. 8 illustrate additional embodiments of an innovativebeam shaper lens. FIG. 7 illustrates a cross sectional view of the beamshaper 50 comprised of optical element 52, which comprises an array oflenslets 54, each with at least one convex surface 53. Optical element55 may comprise a second array of glass lenslets 56, each with at leastone concave surface 57. The convex surfaces 53 of the array of lenslets54 on optical element 52 and the concave surfaces 57 of the array oflenslets 56 on optical element 55 have equal and opposite geometriessuch that the convex surfaces 53 on optical element 52 willsubstantially nest into the concave surfaces 57 on optical element 55.Lenslets 54 and 56, forming matching arrays on optical elements 52 and55, may each be circular or non-circular in cross section.

The cross section may be an ellipse, as illustrated in FIG. 8; however,in alternative embodiments the lenslets 54 and 56, forming arrays mayhave any cross section including, for example, circular, rectangular,ribbed, elliptical, lenticular, or any other shape. The only constrainton the design of such lenslets is that they should be capable of beingdesigned as a matching convex/concave pair that can substantially nestone within the other. FIG. 8 illustrates the cross section view alongthe light beam axis of a portion of optical elements 52 and 55, showingan embodiment of an array structure with elliptical lenslets shape 51.

In order to obtain the desired continuous beam modulating effects, theoptical elements 52 and/or 55 are articulated relative to each other indimension 58 so that the relative distance between the optical elements52 and 55 changes in dimension 58. Additionally, in order to modulatethe angular orientation of the resultant modulating effect, the pair ofoptical elements 52 and 55 are articulated together in a rotationalmanner in the illustrated direction(s) 59 so that the angularorientation of the elliptical lenslets shape 51 are changed in theillustrated direction(s) 59 The mechanisms for achieving thesearticulation(s) are not shown in the figures but are well known in theart.

In an alternative embodiment (not shown) the rotational effect of themodulated eccentricity effect may be achieved by changing theorientation of the lenslets in a linear direction so that the light beamonly passes through a portion of the lens array and the angularorientation of the effect changes as the array is shifted so that thelight beam passes through lenslets with a different orientation.

FIG. 9, FIG. 10, and FIG. 11 illustrate a cross sectional view along thelight beam axis of an alternative embodiment of a beam shaper 60 wherearrays of nesting lenslets 65 are configured on circular discs 62 and 64sharing a central axis 63 and combined in a single assembly. Theassembly comprising circular discs 62 and 64 may be rotated, as shown byarrow 69, about that shared central axis 63 such that the orientation ofthe modulated effect in the output beam (not shown) may also be rotated.Although circular discs 62 and 64 are illustrated herein, the disclosureis not so limited and any shape of arrays of nesting lenslets 65 may beused without departing from the spirit of the disclosure.

Though not shown, the mechanisms for articulation of the discs are wellknown in the art. In some embodiments the optical beam may only passthrough a portion of the disc 61. In such case it is only necessary torotate the disc 90 degrees in order to obtain an appearance of fullrotation of the eccentric beam shape modulation effect. For thisembodiment it may be possible to drive the rotation of the disc from acentral axis. In other embodiments the beam may pass through the entirearray in which case it would be necessary to be able to rotate the discs180 degrees to get the appearance of full rotation of the eccentric beamshape modulation effect. In this case it may be desirable to drive thisrotation from the rim of the disc rather than the center of the disc.

FIG. 10 and FIG. 11 illustrate the cross section of a further embodimentof the disclosure where two optical elements 62 and/or 64 comprisingarrays of nesting lenslets 66 and 70 may be moved parallel to/along thean axis 63 of the luminaire such that their separation varies along theaxis 63 in dimensional direction 68. FIG. 10 shows the optical elements62 and 64 with minimal separation in dimensional direction 68, such thatthe convex surfaces 72 on the lenslets 70 on element 64 are as close asreasonably possible to the concave surfaces 67 on the lenslets 66 onelement 62. In this optical effect of the arrays of curved surfaces iscancelled out and the combination of optical elements 64 and 62 hasalmost no effect on the light beam.

FIG. 11 shows the optical elements 62 and 64 with increased separationin dimensional direction 68, such that the convex surfaces 72 on thelenslets 70 on element 64 are separated from the concave surfaces 67 onthe lenslets 66 on element 62. In this position the optical effect ofthe two curved surfaces is combined such that a circular input lightbeam is constrained to a new cross section with increased beam shaping.

A single pair of optical elements with nesting lenslets has beenillustrated here, however, the disclosure is not so limited and furtherembodiments may utilize a plurality of pairs of optical elements eachwith nesting lenslets. Each pair of optical elements may provide adiffering amount and rotational angle of beam shaping. Such pairs ofelements may be situated in series in the automated luminaire such thatthe light beam passes through all such pairs of optical elements and hasa final beam shape defined by the combined effect of each pair.

FIG. 12 illustrates a view of a further embodiment of a beam shaper 71where two optical elements 74 and 76 comprising arrays of nestinglenslets 75 configured as ribbed or lenticular lenses may be constructedas circular discs sharing a central axis 79 and combined in a singleassembly. The assembly comprising optical elements 74 and 76 may berotated, as shown by arrow 69, about the shared central axis 79 suchthat the output beam may also be rotated. Although circular discs areillustrated, the disclosure is not so limited and any shape of arrays ofnesting lenslets may be used without departing from the spirit of thedisclosure.

FIG. 13 and FIG. 14 illustrate a further embodiment of a luminaireemploying two beam shaper lens pairings where light source 22 projects abeam through a series of beam shapers: first beam shaping pair 60 of twooptical elements 62 and 64 comprising arrays of nesting lenslets 66 and70 configured as ribbed or lenticular lenses and a second beam shapingpair 90 of two optical elements 92 and 94 comprising arrays of nestinglenslets 96 and 98 configured as ribbed or lenticular lenses. The firstand second beam shaping pairs 60 and 90 of optical elements 62, 64 and92, 94 may be constructed as circular discs each sharing a central axisand combined in a single assembly. The assembly comprising opticalelements 60 and 62 may be rotated about a shared central axis such thatthe output beam (not shown) may also be rotated. Further, each pair ofoptical elements 62, 64 and 92, 94 comprising arrays of nesting lenslets66 and 70 and 96 and 98 may be moved parallel to the central axis 63 ofthe luminaire such that their separation may be independently variedalong that axis.

FIG. 13 shows the optical elements with minimal separation indimensional directions 68 and 78 such that the convex surfaces 72 on thelenslets 70 on optical element 60 are as close as reasonably possible tothe concave surfaces 67 on the lenslets 66 on optical element optical62, and the convex surfaces 97 on the lenslets 96 on optical element 92are as close as reasonably possible to the concave surfaces 99 on thelenslets 98 on optical element 94. In these positions the opticaleffects of the arrays of curved surfaces is cancelled out and thecombination of elements 62, 64 and 92, 94 has almost no effect on thelight beam.

FIG. 14 shows the optical elements with increased separation indimensional directions 68 and 78 such that the convex surfaces 72 on thelenslets 70 on optical element 64 are separated from the concavesurfaces 67 on the lenslets 66 on optical element 62, and the convexsurfaces 97 on the lenslets 96 on optical element 92 are independentlyseparated from the concave surfaces 99 on the lenslets 98 on opticalelement 94. In these positions the optical effect of the two arrays ofcurved surfaces is combined such that a circular input light beam isconstrained to a new cross section with increased beam shaping from thecombination of optical elements 62 and 64 and 92 and 94. In a furtherembodiment at least one pair of optical elements 62, 64 and 92, 94 mayhave a circular cross section as previously described such that theeffect produced by that pair of optical elements is limited to beam sizeand there is no effect on the shape of the output beam. Further, theassemblies comprising optical elements 62, 64 and 92, 94 may beseparately rotated about a central axis 63 such that the output beam mayalso be rotated.

In the case of lenslets with circular cross sections, rotation of thearray will provide no meaningful effect. In some embodiments the lastoptical element 94 in the optical train is fixed. This is beneficial fora luminaire because this element can then serve as part of theluminaires housing, protecting the inner workings of the luminaire.However, it is not crucial as to which elements are actuated and whichare fixed. It is important that the relative distance between elementswithin a pair can be varied and that their rotation can be coordinatedso that the concave and convex lenslets can remain aligned duringrotation of the array. Although circular discs are illustrated thedisclosure is not so limited and any shape of arrays of nesting lensletsmay be used without departing from the spirit of the disclosure.

FIG. 15 illustrates a cross sectional view of an alternative embodimentof a beam shaper 100. This beam shaper has three optical elements 102,104 and 106 which each have arrays of lenslets. In this embodiment thefirst optical element 102 has an array of convex shaped lenslets 108with convex surfaces 109 which face and nest with concave surfaces 111on concave lenslets 110 on element 104. The other side of element 104has an array of convex lenslets 112 with convex surfaces 113 which faceand nest with concave surfaces 115 on concave lenslets 114 on element106.

FIG. 16 illustrates a cross sectional view of yet another embodiment ofa beam shaper 201. In this case the light source is an array 202 oflight emitting diode (LED) sources 204. In the embodiment shown thereare two beam shaping pairs 206 and 208. The pairings of optical elements210 and 212 for beam shaping pair 206 and 214 and 216 for beam shapingpair 208 are similar to the previously described nesting lensletpairings. They may be rotated about a central axis by an axle or may bedriven to rotate from the outer edges. In some embodiments the beamshaping pair 206 and 208 may be rotated as a unit with the light source202 in order to obtain change in the angular orientation of theeccentric modulated effect. The lenslets of these arrays may becircular, square, rectangular, or any other shape.

FIG. 17 illustrates an alternative embodiment of a beam shaper 220employing an LED array light source 202. In this embodiment the convexsurfaces 205 of the individual LED sources 204 is employed to serve as alenslet array that nests with an optical element 222 with an array ofconcave lenslets 224 with concave surfaces 223.

Although the disclosure has been primarily described and illustratedwith lenslets that are essentially elliptical in cross section thedisclosure is not so limited and any cross section including, forexample, circular, rectangular, ribbed, elliptical, lenticularm or anyother shape may be used without departing from the spirit of thedisclosure.

In a yet further embodiment a plurality of pairs of optical elementseach with nesting lenslets is utilized where at least one of theplurality of optical elements with nesting lenslets may have lensletswith an elliptical cross section where the eccentricity of the ellipsesis in unity such that the lenslets are circular in cross section andprovides a beam angle control only with no change in beam shape.

It should be appreciated that in any cases where articulation ofelements is called for herein but not shown, it is well within the knownart to provide a variety of mechanisms that can achieve these necessaryarticulations.

While the disclosure has been described with respect to a limited numberof embodiments, those skilled in the art, having benefit of thisdisclosure, will appreciate that other embodiments may be devised whichdo not depart from the scope of the disclosure as disclosed herein. Thedisclosure has been described in detail, it should be understood thatvarious changes, substitutions and alterations can be made heretowithout departing from the spirit and scope of the disclosure.

The invention claimed is:
 1. An automated luminaire comprising: a lightbeam generating light source; a pair of lenticular lenslet arrays whichare mounted to intersect and modulate the light beam; wherein thelenticular lenslets of one array are shaped so a plurality of convexlenslets of one array nest into a plurality of concave lenslets of theother array; wherein at least one lenslet array of the pair isarticulated to change the separation distance between the lensletarrays; and wherein at least one lenslet array of the pair isarticulated to rotate about a center of rotation and wherein the centerof rotation of the lenslet array is outside the light beam.
 2. Theautomated luminaire of claim 1 wherein the lenslet array farthest fromthe light source is fixed in position relative to the light beam.
 3. Theautomated luminaire of claim 1 wherein the light source is an array oflight sources.
 4. The automated luminaire of claim 3 wherein the lightsource is an array of light emitting diodes (LEDs).
 5. The automatedluminaire of claim 1 wherein the light beam comprises a central axis,and the axis of rotation of the at least one lenslet array is parallelwith the central axis of the light beam.
 6. The automated luminaire ofclaim 1 wherein the light beam comprises an axis and both lenslet arraysare articulated to move along the axis of the light beam.
 7. Theautomated luminaire of claim 1, wherein the pair of lenticular lensletarrays comprises a first pair of lenticular lenslet arrays, theautomated luminaire further comprising a second pair of lenticularlenslet arrays, mounted to intersect and modulate the light beam;wherein the lenticular lenslets of one array of the second pair areshaped so a plurality of convex lenslets of the one array nest into aplurality of concave lenslets of the other array of the second pair;wherein at least one lenslet array of the second pair is articulated tochange the separation distance between the lenslet arrays of the secondpair; and wherein at least one lenslet array of the second pair isarticulated to rotate about a center of rotation and wherein the centerof rotation of the one lenslet array of the second pair is outside thelight beam.
 8. The automated luminaire of claim 7 wherein the lightsource is an array of light sources.
 9. The automated luminaire of claim8 wherein the light source is an array of LEDs.
 10. The automatedluminaire of claim 7 wherein the light beam comprises a central axis,and the axis of rotation of the first pair of lenslet arrays is parallelwith the central axis of the light beam.
 11. The automated luminaire ofclaim 7 wherein the light beam comprises an axis and both the first andsecond pairs of lenslet arrays are articulated to move along the lightbeam axis.
 12. The automated luminaire of claim 7 wherein both the firstand second pairs of lenslet arrays comprise a lenslet array which isarticulated to rotate in the light beam.
 13. The automated luminaire ofclaim 7 wherein the light beam comprises a central axis, and the axis ofrotation of the at least one lenslet array of each of the first andsecond pairs of lenslet arrays is parallel with the central axis of thelight beam.
 14. The automated luminaire of claim 7 wherein the lightbeam comprises an axis and both lenslets arrays in both pairs of lensletarrays are articulated to move along the axis of the light beam.
 15. Theautomated luminaire of claim 7 wherein the light beam comprises an axisand all but the lenslet array furthest from the light source arearticulated to move along the axis of the light beam.
 16. The automatedluminaire of claim 7 wherein the light beam comprises an axis and thelenslet array furthest from the light source is fixed in positionrelative to the light beam.